A handful of elderly sea turtles in American aquariums have become local legends, living out long retirements under human care because injuries or disabilities mean they would not survive if released back into the ocean.
Myrtle, the matriarch in Boston
Myrtle the green sea turtle is the undisputed star of the New England Aquarium’s Giant Ocean Tank in Boston, where she’s lived since 1970 after arriving from a closing marine aquarium in Provincetown. Staff estimate she is somewhere between her 80s and mid‑90s, making her one of the oldest known sea turtles in human care and a daily draw for visitors who watch her dedicated feeding sessions.
Myrtle wasn’t part of a modern rescue-and-release program; she entered aquariums decades ago, before today’s strict rehabilitation standards, and has spent more than half a century acclimated to life under human care. At this point, her advanced age, long captivity, and dependence on predictable, prepared diets mean she would have little chance of foraging successfully or navigating hazards in the wild, so aquarists regard her as a permanent resident and an ambassador for endangered green sea turtles.
Calypso, the one‑flipper “tripawd” turtle
Calypso, a green sea turtle who lived at the National Aquarium in Baltimore until 2020, became famous as the “tripawd turtle” because she thrived despite losing a front flipper. She was rescued in Long Island Sound around 2000 with a badly infected left front flipper; veterinarians amputated it to save her life, and she later grew into a 500‑pound adult at the aquarium’s Blacktip Reef exhibit.
When she was rescued, federal authorities and veterinarians classified any sea turtle missing a flipper as non‑releasable, because an amputation permanently compromises swimming, diving, and escaping predators. With one front flipper gone, Calypso would have struggled to migrate, forage efficiently, or evade boats and sharks in the open ocean, so she remained in Baltimore as a long‑term educational resident instead of returning to the wild.
Boba Fett and Kai, turtles that cannot dive
Some of today’s well‑known rescued turtles live in aquariums because spinal or buoyancy problems keep them from diving, a basic survival skill in the wild. Boba Fett, a green sea turtle rescued in Florida in 2018, arrived at SeaWorld with a severely fractured shell and spinal injury likely caused by a boat strike; even after his wounds healed, he remained permanently “positively buoyant,” floating at the surface and unable to dive.
Similarly, Kai, a juvenile green sea turtle now housed by the National Aquarium, suffered a boat‑strike spinal injury that damaged nerves involved in digestion and gas regulation, leaving her unable to control buoyancy and dive for food despite extensive treatment. Because turtles that cannot dive cannot properly forage, avoid predators, or cope with storms, federal agencies deemed both Boba Fett and Kai non‑releasable and approved long‑term aquarium placement as their best chance at a normal, healthy life.
What “non‑releasable” means for sea turtles
Under U.S. endangered species permits, rescued sea turtles are supposed to be rehabilitated and released unless they have permanent disabilities that would prevent survival in the wild. Official guidance lists conditions like permanent bilateral blindness, severe spinal cord injuries, chronic buoyancy problems that stop a turtle from diving, or limb loss that seriously impairs swimming and feeding as reasons a turtle may be classified as non‑releasable instead of returned to the ocean.
When a turtle meets those criteria but can still live comfortably, aquariums and marine centers may keep it in captivity for long‑term care and public education rather than opting for euthanasia. In practice, that’s why many of the oldest and most famous turtles in American aquariums are there: injuries from boat strikes, fishing gear, infections, or congenital issues left them unable to see, swim, or dive well enough to survive on their own, so they now serve as living symbols of their species’ challenges while enjoying stable, monitored care.
Why these turtles aren’t put back into the wild
Across all these stories, the same key reasons appear:
-
Long captivity and age: Animals like Myrtle have spent decades in aquariums and are elderly, so they lack recent experience hunting, migrating, and avoiding hazards in the wild.
-
Permanent physical disabilities: Amputated flippers, spinal injuries, or severe wounds reduce swimming power and maneuverability, making it hard to migrate, escape predators, or reach nesting and feeding grounds.
-
Buoyancy and diving problems: Boat‑strike spinal damage often leads to chronic positive buoyancy, leaving turtles stuck at the surface where they cannot properly feed and are highly exposed to boats and predators.
-
Sensory loss and serious illness: Conditions such as permanent blindness or untreatable disease can prevent a turtle from finding food or navigating, and guidelines explicitly flag these as reasons not to release.
In short, the goal of modern rescue programs is always release when possible, but when a turtle’s injuries mean release would almost certainly be a death sentence, aquariums provide a permanent home where these long‑lived reptiles can continue to thrive and inspire people to care about ocean conservation.